every tomtom Nav3 , Nav4 and Nav5 you can change into Truck or Camper version , using MSTMS patch
on Nav3 you can use TTActivator ... use Europe truck map and navcore patch truck for trasform any Nav3 into a Truck version or use normal navcore patch and Europe Camper map to trasform your tomtom into Camper
about Nav4 and Nav5 they have only one software/navcore and there is the MSTMS patch for Camper or truck version , at the same time tomtom for camper use europe camper map + MSTMS camper patch and europe truck map and MSTMS truck patch for trasform your tomtom into Truck
so with MSTMS patchs now you can modify everyt omtom into a TRUCK or Camper version
if i not wrong it's like i told you now !